package com.chinacoal.microservice.Interceptor;


import com.auth0.jwt.JWT;
import com.chinacoal.microservice.util.CodeMsg;
import com.chinacoal.microservice.util.OrderNumberUtil;
import com.chinacoal.microservice.util.PassToken;
import com.chinacoal.microservice.util.UserLoginToken;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;
import java.util.concurrent.TimeUnit;

/**
 * @author zhuliang
 * @version V1.0
 * @Description: 微信公众号-登录-拦截器
 * @date 2020-12-28 11：56
 */
public class WechatAuthenticationInterceptor implements HandlerInterceptor {

    @Autowired
    private RedisTemplate redisTemplate;

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object object) throws CodeMsg {
        String token = httpServletRequest.getHeader("token");// 从 http 请求头中取出 token
        // 如果不是映射到方法直接通过
        if(!(object instanceof HandlerMethod)){
            return true;
        }
        HandlerMethod handlerMethod=(HandlerMethod)object;
        Method method=handlerMethod.getMethod();
        //检查是否有passtoken注释，有则跳过认证
        if (method.isAnnotationPresent(PassToken.class)) {
            PassToken passToken = method.getAnnotation(PassToken.class);
            if (passToken.required()) {
                return true;
            }
        }
        //检查有没有需要用户权限的注解
        if (method.isAnnotationPresent(UserLoginToken.class)) {
            UserLoginToken userLoginToken = method.getAnnotation(UserLoginToken.class);
            if (userLoginToken.required()) {
                // 执行认证
                if (token == null || "".equals(token)) {
                    throw CodeMsg.INVALID_TOKEN;
                }

                // 验证 token
                try {
                    OrderNumberUtil.verifyJwt(token);
                } catch (Exception e){
                    throw CodeMsg.TOKEN_ABNORMAL_FORMAT;
                }

                //得到租户联系方式
                String phone = JWT.decode(token).getClaim("phone").asString();

                //从redis中获取token
                String t = (String) redisTemplate.opsForValue().get("wechat:" + phone);

                //判断是否失效
                if (null == t || "".equals(t) || "null".equals(t)) {
                    throw CodeMsg.INVALID_TOKEN;
                }

                //判断是否异地登录
                if (!token.equals(t)){
                    throw CodeMsg.REMOTE_LOGIN;
                }

                //延长过期时间
                redisTemplate.opsForValue().set("wechat:" + phone, token, 1, TimeUnit.HOURS);

                return true;
            }
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest,
                           HttpServletResponse httpServletResponse,
                           Object o, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest,
                                HttpServletResponse httpServletResponse,
                                Object o, Exception e) throws Exception {
    }
}
